/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet.chat;

import com.google.gson.Gson;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.db.FriendsDB;
import model.User;
import model.Users;

/**
 *
 * @author user
 */
public class FriendServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/plain;charset=UTF-8");
        PrintWriter out = response.getWriter();

        StringBuilder sb = new StringBuilder();
        FriendsDB friendsDB;
        Users friends;
        Integer userId = (Integer) request.getSession().getAttribute("id");
        String action = request.getParameter("action");

        try {
            if (userId != null) {
                if (action.equals("get")) {
                    Gson gson = new Gson();
                    friendsDB = new FriendsDB();

                    friends = friendsDB.find(userId);
                    setAtributeOnline(friends);
                    String strFriends = gson.toJson(friends);
                    System.out.println("friends : " + strFriends);
                    sb.append(strFriends);
                }

                if (action.equals("addfriend")) {
                    String username = request.getParameter("username");
                    if (username != null && username.length() > 0) {
                        friendsDB = new FriendsDB();
                        friendsDB.addFriend(userId, username);
                    }
                }
            }

            out.println(sb.toString());
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private void setAtributeOnline(Users friends) {
        Users loginUsers = (Users) getServletContext().getAttribute("loginUsers");

        for (int i = 0; i < friends.size(); ++i) {
            User user = friends.get(i);
            if (loginUsers.find(user.id) != null) {
                user.online = true;
            }
        }
    }
}
